CN112382674A - MWT battery, MWT battery hole-filling slurry, glass material and glass material raw material composition - Google Patents

MWT battery, MWT battery hole-filling slurry, glass material and glass material raw material composition Download PDF

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CN112382674A
CN112382674A CN202011136927.XA CN202011136927A CN112382674A CN 112382674 A CN112382674 A CN 112382674A CN 202011136927 A CN202011136927 A CN 202011136927A CN 112382674 A CN112382674 A CN 112382674A
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mwt
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裘慧广
史卫利
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Wuxi Dike Electronic Mat Co ltd
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Wuxi Dike Electronic Mat Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H01L31/022441—Electrode arrangements specially adapted for back-contact solar cells
    • H01L31/02245—Electrode arrangements specially adapted for back-contact solar cells for metallisation wrap-through [MWT] type solar cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/50—Photovoltaic [PV] energy

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Abstract

The application relates to the field of metal-through-winding silicon solar cells, in particular to an MWT cell, MWT cell hole-filling slurry, glass frit and glass frit raw material composition. The composition for preparing the MWT battery hole-filling slurry glass material mainly comprises the following components in parts by weight: 60-80 parts of P2O51-8 parts of CuO, 2-8 parts of MgO, 4-10 parts of CaO and 3-8 parts of SiO2And 1-6 parts of K2And O. The phosphate glass has weak corrosion capability, can avoid the occurrence of over-etching phenomenon so as to avoid the condition of generating electric leakage by damaging PN junctions, and has no influence on stable state electric leakage. CuO can effectively improve the wettability of glass, thereby having good soldering effect. When the glass material prepared by the mutual compatibility of all the substances is used for MWT battery hole-filling slurry, the adhesive force of the hole-filling slurry can be improved, and the solidified slurry is prevented from falling off.

Description

MWT battery, MWT battery hole-filling slurry, glass material and glass material raw material composition
Technical Field
The application relates to the field of metal-through-winding silicon solar cells, in particular to an MWT cell, MWT cell hole-filling slurry, glass frit and glass frit raw material composition.
Background
MWT cells are short for metal wrap-through (MWT) silicon solar cells. The MWT battery eliminates the main grid line of the front electrode by using the laser drilling and back wiring technology, and the current collected by the fine grid line of the front electrode is led to the back side through the silver paste in the hole, so that the positive electrode point and the negative electrode point of the battery are distributed on the back side of the battery piece, the shading of the front grid line is effectively reduced, the conversion efficiency is improved, and meanwhile, the consumption of the silver paste and the minority carrier recombination loss of a metal electrode-emitter electrode interface are reduced.
However, the grouting slurry in the prior art has the problem of easy falling due to poor adhesion after filling holes.
Disclosure of Invention
An object of the embodiments of the present application is to provide an MWT battery, an MWT battery hole-filling paste, a glass frit, and a glass frit raw material composition, which are used to improve the problem of poor adhesion of the existing MWT battery conductive paste.
The application provides a composition for preparing MWT battery hole-filling slurry glass material, which mainly comprises the following components in parts by weight:
60-80 parts of P2O51-8 parts of CuO, 2-8 parts of MgO, 4-10 parts of CaO and 3-8 parts of SiO2And 1-6 parts of K2O。
The phosphate glass has weak corrosion capability, can avoid the occurrence of over-etching phenomenon so as to avoid the condition of generating electric leakage by damaging PN junctions, and has no influence on stable state electric leakage. CuO can effectively improve the wettability of glass, thereby having good soldering effect. When the glass material prepared by the mutual compatibility of all the substances is used for MWT battery hole-filling slurry, the adhesive force of the hole-filling slurry can be improved, and the solidified slurry is prevented from falling off.
In some embodiments of the first aspect of the present application, it consists essentially of, in parts by weight:
65-75 parts of P2O53-7 parts of CuO, 3-7 parts of MgO, 5-9 parts of CaO and 5-7 parts of SiO2And 2-5 parts of K2O。
The second aspect of the present application provides a glass frit of the MWT battery hole-filling paste, including:
the glass material of the MWT battery hole-filling slurry is prepared by melting and cooling the composition for preparing the MWT battery hole-filling slurry glass material.
Optionally, crushing the cooled material.
The third aspect of the application provides a MWT battery hole-filling slurry, which mainly comprises an organic carrier, conductive particles and the glass frit.
The glass material can improve the adhesive force between the MWT battery hole-filling slurry and the inner wall of the hole, and avoid falling off; the MWT battery hole filling slurry can avoid electric leakage caused by transitional etching, has small damage to PN junctions, and has no influence on stable electric leakage.
In some embodiments of the third aspect of the present application, the MWT battery hole-filling slurry essentially comprises the following components in parts by weight:
8-12 parts of the organic carrier, 80.3-93 parts of the conductive particles and 1-5 parts of the glass frit;
optionally, the MWT battery hole-filling slurry comprises 8.5-9.5 parts of the organic carrier.
Optionally, the MWT battery hole-filling slurry comprises 2-3 parts of the glass material.
In some embodiments of the third aspect of the present application, the conductive particles comprise silver powder and zinc powder;
the silver powder accounts for 80-90 parts by weight of the MWT battery hole-filling slurry; the zinc powder accounts for 0.3-3 parts by weight of the MWT battery hole-filling slurry;
optionally, the silver powder accounts for 85-90 parts by weight of the MWT battery hole-filling slurry; the zinc powder accounts for 0.3-2 parts of the MWT battery hole-filling slurry.
The conductive particles comprise silver powder and zinc powder, and the MWT battery hole filling slurry and the silicon crystal form Ag-Si-Zn alloy, so that the adhesion between the slurry and the battery piece after solidification is further increased.
In some embodiments of the third aspect of the present application, the silver powder has an average particle size of 1.5 to 1.7 μm;
optionally, the silver powder has an average particle size of 1.5 to 1.6 μm.
In some embodiments of the third aspect of the present application, the zinc powder has an average particle size of 1.6 to 1.8 μm;
alternatively, the zinc powder has an average particle diameter of 1.7 to 1.8 μm.
In some embodiments of the third aspect of the present application, the glass frit has an average particle size of 1.8 to 2.0 μm.
The fourth aspect of the application provides an MWT battery, and the MWT battery is prepared by filling a grouting hole in a battery piece with the MWT battery grouting hole slurry provided by the third aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 shows the reverse current Irev2 test results for the MWT cells provided in comparative examples 1 to 4.
Fig. 2 shows the leakage distribution of the cell of comparative example 1.
Figure 3 shows an external view of the MWT cell provided in example 2 after the 3M tape was pulled.
Fig. 4 shows the appearance of the MWT cells of comparative example 4 and comparative example 1 after soldering.
Fig. 5 shows the appearance of the MWT cell of example 2 after soldering with dupont paste.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The MWT cell, MWT cell pore-filling paste, glass frit and glass frit raw material composition of the examples of the present application are specifically described below.
The composition for preparing the MWT battery hole-filling slurry glass material mainly comprises the following components in parts by weight:
60-80 parts of P2O51-8 parts of CuO, 2-8 parts of MgO, 4-10 parts of CaO and 3-8 parts of SiO2And 1-6 parts of K2O。
Illustratively, P2O5The parts by weight in the composition may be 60 parts, 62 parts, 65 parts, 67 parts, 70 parts, 72 parts, 75 parts, 78 parts, or 80 parts, and the like.
Illustratively, the CuO may be present in the composition in an amount of 1 part, 1.2 parts, 2 parts, 3 parts, 3.5 parts, 4 parts, 5 parts, 7 parts, or 8 parts by weight, or the like.
Illustratively, the weight fraction of MgO in the composition can be 2 parts, 2.5 parts, 3 parts, 4 parts, 4.5 parts, 5 parts, 6 parts, 7 parts, or 8 parts, and so forth.
Illustratively, the weight parts of CaO in the composition may be 4 parts, 4.5 parts, 7 parts, 7.2 parts, 7.6 parts, 8 parts, 8.7 parts, 9 parts, or 10 parts, and so forth.
Illustratively, SiO2The parts by weight in the composition may be 3 parts, 3.4 parts, 4.5 parts, 5.5 parts, 6.2 parts, 7.3 parts, 8 parts, or the like.
Illustratively, K2The weight portion of O in the composition can be 1 part, 1.2 parts, 2 parts, 3 parts, 3.5 parts, 4.4 parts, 5.2 parts, 6 parts, or the like.
The raw material of the glass frit comprises P2O5The phosphate glass has weaker corrosion capability, so that the etching in an SE (Selective Emitter) process hole in the MWT crystalline silicon cell is weaker, the damage to a PN junction is smaller, the electric leakage is avoided, and the steady-state electric leakage is not influenced. CuO can effectively improve the wettability of glass, thereby having good soldering effect. When the glass material prepared by the mutual compatibility of all the substances is used for MWT battery hole-filling slurry, the adhesive force of the hole-filling slurry can be improved, and the cured slurry is preventedAnd (5) dropping the materials.
As an example, the present application also provides a glass frit of MWT battery hole-filling slurry, which is prepared by melting and cooling the composition for preparing the glass frit of MWT battery hole-filling slurry.
For example, in some embodiments herein, the composition of the MWT cell pore-filling paste frit may be melted at 1250 ℃ to 1400 ℃.
In some embodiments of the present application, the method further comprises crushing the cooled material.
In some embodiments, the molten glass is shaped during cooling; in some embodiments, the cooled material may be crushed, for example, by pouring the molten glass into a tablet press to form a sheet, and then placing the sheet into a ball mill for ball milling. The particle size after crushing is set according to the requirement.
The application also provides the MWT battery hole-filling slurry which mainly comprises an organic carrier, conductive particles and the glass material.
Illustratively, organic carriers include ethyl cellulose, acrylic resins, butyl carbitol, and butyl carbitol acetate.
Optionally, the organic vehicle comprises ethyl cellulose, polyamide wax, butyl carbitol, and butyl carbitol acetate.
In some embodiments, the organic vehicle may be 8 to 10 parts by weight in the MWT battery hole-filling slurry. For example, in the MWT battery hole-filling slurry, the organic vehicle may be 8 parts, 8.2 parts, 8.5 parts, 8.9 parts, 9.5 parts, or 10 parts by weight, or the like.
The MWT battery hole-filling slurry also comprises the glass material; the raw materials of the glass frit mainly comprise the following components in parts by weight: 60-80 parts of P2O51-8 parts of CuO, 2-8 parts of MgO, 4-10 parts of CaO and 3-8 parts of SiO2And 1-6 parts of K2O。
In some embodiments, the MWT battery pore-filling slurry consists essentially of, in parts by weight:
8-12 parts of organic carrier, 80.3-93 parts of conductive particles and 1-5 parts of glass frit;
illustratively, the MWT battery hole-filling slurry comprises 2-3 parts by weight of glass frit. For example, the weight parts of the glass frit to the MWT battery hole-filling slurry may be 2 parts, 2.2 parts, 2.5 parts, 2.7 parts, or 3 parts, and so on.
The weight portion of the conductive particles in the MWT battery hole-filling slurry can be 80.3 parts, 82 parts, 85 parts, 89 parts, 90 parts or 93 parts, and the like.
In embodiments of the present application, the conductive particles may include, for example, at least one of silver, gold, copper, iron, vanadium, titanium, chromium, manganese, cobalt, nickel, zinc, rhodium, palladium, and platinum. The ratio of each metal in the conductive particles can be any ratio.
For example, in the present embodiment, the conductive particles include silver powder and zinc powder. Wherein the silver powder accounts for 80-90 parts by weight of the MWT battery hole-filling slurry; the mass percentage of the zinc powder in the MWT battery hole-filling slurry is 0.3-3 parts.
Illustratively, the weight parts of the silver powder to the MWT battery hole-filling slurry can be 80 parts, 82 parts, 84 parts, 85 parts, 87 parts, 88 parts, 89.5 parts or 90 parts, and the like. The average particle diameter of the silver powder is 1.5 μm to 1.7. mu.m, and for example, the average particle diameter of the silver powder may be 1.5. mu.m, 1.56. mu.m, 1.6. mu.m, 1.65. mu.m, or 1.7. mu.m, or the like.
It is understood that, in other embodiments of the present application, the average particle diameter of the silver powder may not be within the above range.
Illustratively, the zinc powder may be 0.3 parts, 0.5 parts, 1 part, 1.2 parts, 1.9 parts, 2 parts, 2.5 parts, 3 parts, or the like, by weight, based on the MWT cell pore-filling slurry. The average grain diameter of the zinc powder is 1.6-1.8 mu m; for example, the average particle diameter of the zinc powder may be 1.6 μm, 1.66 μm, 1.7 μm, 1.75 μm, 1.8 μm, or the like.
It should be noted that in the examples of the present application, the average particle diameter of the zinc powder may not be within the above range.
Alternatively, in other embodiments of the present application, the sizes of the zinc powder and the silver powder may not be described by using the average particle diameter, and for example, may be described by directly using a particle diameter range or the like.
The glass material provided by the application can improve the adhesive force between the MWT battery hole-filling slurry and the inner wall of the hole, and can avoid falling off; the MWT battery hole-filling slurry can avoid electric leakage caused by transitional etching, and the MWT battery hole-filling slurry has small damage to PN junctions and has no influence on stable electric leakage. The conductive particles comprise silver powder and zinc powder, the MWT battery hole filling slurry and the silicon crystal form Ag-Si-Zn alloy, the adhesive force is further increased, and the tensile force of the MWT battery piece welding strip tensile test is high.
It is understood that in some other embodiments of the present application, other metal particles or metal powder may be used as the conductive particles in the MWT battery hole-filling paste.
The application also provides an MWT battery, and the MWT battery is manufactured by filling the grouting holes in the battery piece with the MWT battery grouting hole slurry.
Illustratively, the MWT battery hole-filling slurry is printed into the filling holes of the MWT crystalline silicon battery sheet by a screen printer. And sintering the printed silicon wafer in a sintering furnace.
In summary, the MWT battery provided by the embodiment of the present application, because the MWT battery hole-filling slurry is used, the part in the obtained MWT battery hole-filling is not easy to fall off, and the 3M adhesive tape is used for no pull-off, so that the soldering tin effect is better. In some embodiments, Ag-Si-Zn alloy is formed on the surface of the silicon wafer, so that the bonding force is stronger, and a good adhesion effect is achieved.
The features and properties of the present application are described in further detail below with reference to examples.
158cm was used for MWT crystalline silicon cells used in the following comparative examples and examples2A single crystal silicon wafer.
Example 1
The embodiment provides a glass material of MWT battery hole-filling slurry, the MWT battery hole-filling slurry and an MWT battery.
The glass material of the MWT battery hole-filling slurry is mainly prepared by the following steps:
the raw materials are prepared according to the following mass percentage：P2O5 73.35％，CuO 4％，MgO 5.86％，CaO 7.99％，SiO26.3% and K2O 2.5％。
Fully mixing the weighed raw materials, putting the mixed mixture into a platinum crucible, then putting the platinum crucible into an electric furnace with the furnace temperature of 1300 ℃, and preserving heat for 1 h; pouring the molten glass into a tablet machine to be pressed into slices, and then putting the flaky glass into a ball mill to be ball-milled; and sieving the ball-milled glass powder to obtain the glass material.
The MWT battery hole-filling slurry is mainly prepared by the following steps:
preparing the following raw materials in percentage by mass: 8.8% of an organic vehicle, 88.5% of silver powder, 0.5% of zinc powder and 2.2% of the above glass frit; wherein the organic carrier is 20 wt% of ethyl cellulose, 20 wt% of acrylic resin, 40 wt% of butyl carbitol and 20 wt% of butyl carbitol acetate.
The silver powder is powder with an average particle size of 1.5-1.7 μm from Nippon Hooker Co Ltd;
the zinc powder is the zinc powder with the average grain diameter of 1.6-1.8 mu m of Shanghai Chaowei nanometer science and technology Limited;
the average particle size of the glass frit is 1.8 to 2.0. mu.m.
Mixing the glass material, the organic carrier and the silver powder to prepare a mixture, adding the zinc powder to mix, putting the mixture into a three-roller machine to perform full binding after mixing, and preparing slurry.
The MWT battery is mainly prepared by the following steps:
and printing the MWT battery hole-filling slurry onto the MWT crystalline silicon battery piece through a screen printer. And sintering the printed silicon wafer in a sintering furnace.
Example 2
Example 2 also provides an MWT cell pore-filling slurry and an MWT cell.
Example 2 differs from example 1 in the raw materials of the MWT cell pore-filling slurry.
In example 2, the MWT battery hole-filling slurry mainly comprises the following components in percentage by mass:
8.8% of an organic vehicle, 87.5% of silver powder, 1.5% of zinc powder and 2.2% of the glass frit of the hole-filling paste of example 1 providing an MWT cell; wherein the organic carrier is 20 wt% of ethyl cellulose, 20 wt% of acrylic resin, 40 wt% of butyl carbitol and 20 wt% of butyl carbitol acetate.
The MWT cell of this example was produced in the same manner as in example 1.
Example 3
Example 3 also provides a glass frit for a MWT cell hole-filling paste, and a MWT cell.
Referring to example 1, example 3 differs from example 1 in the raw materials of the glass frit of the MWT cell hole-filling paste are different;
in this embodiment, the glass frit of the MWT battery hole-filling slurry is prepared from the following raw materials in percentage by mass:
P2O5 60％，CuO8％，MgO 8％，CaO 10％，SiO28% and K2O 6％。
Example 4
Example 4 also provides a glass frit for a MWT cell hole-filling paste, and a MWT cell.
Referring to example 1, example 4 differs from example 1 in the raw materials of the glass frit of the MWT cell hole-filling paste are different;
the MWT battery hole-filling slurry is prepared from the following raw materials in percentage by mass:
P2O5 80％，CuO1％，MgO 2％，CaO 5％，SiO26% and K2O 6％。
Example 5
Example 5 also provides an MWT cell hole-filling slurry and an MWT cell.
Referring to example 3, the MWT battery hole-filling paste provided in example 5 is prepared by using the glass frit of the MWT battery hole-filling paste provided in example 3.
In example 5, the MWT cell hole-filling slurry was prepared mainly by the following steps:
preparing the following raw materials in percentage by mass: 12% of an organic vehicle, 80% of silver powder, 3% of zinc powder and 5% of the glass frit of example 3; wherein the organic carrier is 20 wt% of ethyl cellulose, 20 wt% of polyamide wax, 40 wt% of butyl carbitol and 20 wt% of butyl carbitol acetate.
Example 6
Example 6 also provides an MWT cell hole-filling slurry and an MWT cell.
Referring to example 1, the MWT battery hole-filling paste provided in example 6 is prepared by using the glass frit of the MWT battery hole-filling paste provided in example 1.
In this embodiment, the MWT battery hole-filling slurry is mainly prepared by the following steps:
preparing the following raw materials in percentage by mass: 8.8% of an organic vehicle, 89% of silver powder and 2.2% of the glass frit of example 1; wherein the organic carrier is 20 wt% of ethyl cellulose, 20 wt% of polyamide wax, 40 wt% of butyl carbitol and 20 wt% of butyl carbitol acetate.
Comparative example 1
The comparative example provides a glass frit for a hole-filling paste for an MWT cell, and an MWT cell.
Referring to example 2, comparative example 1 differs from example 2 in the raw materials of the glass frit of the MWT cell hole-filling paste are different;
in the comparative example, the raw materials of the glass frit of the MWT battery hole-filling slurry are prepared according to the following mass percentages:
P2O5 82.35％，CuO 1％，MgO 2.86％，CaO 4.99％，SiO2 6.3％，K2O 2.5％。
comparative example 2
The comparative example provides a glass frit for a hole-filling paste for an MWT cell, and an MWT cell.
Referring to example 1, comparative example 2 differs from example 1 in the raw material of the glass frit of the MWT cell hole-filling paste is different.
In the comparative example, the raw materials of the glass frit of the MWT battery hole-filling slurry are prepared according to the following mass percentages:
P2O5 82.35％，CuO 1％，MgO 2.86％，CaO 4.99％，SiO26.3% and Na2O 2.5％。
Comparative example 3
The comparative example provides a glass frit for a hole-filling paste for an MWT cell, and an MWT cell.
Referring to example 2, comparative example 3 differs from example 2 in the raw material of the glass frit of the MWT cell hole-filling paste is different.
In the comparative example, the raw materials of the glass frit of the MWT battery hole-filling slurry are prepared according to the following mass percentages:
P2O5 83.35％，MgO 2.86％，CaO 4.99％，SiO26.3% and K2O 2.5％。
Comparative example 4
The comparative example used a slurry purchased from dupont slurry (day on line); and MWT cells were prepared using the method of example 1.
Test examples
The MWT cells provided in examples 1-6 and comparative examples 1-4 were tested; the photoelectric conversion efficiency Eff and the reverse current Irev2 of the solar cell are measured by a solar cell sorter at 25 ℃ and standard atmospheric pressure.
The test results are shown in table 1. Wherein the 3M test before poaching refers to that a 3M adhesive tape is adopted to adhere and pull off the MWT battery before poaching, the 3M test after poaching refers to that a 3M adhesive tape is adopted to adhere and pull off the MWT battery after poaching, OK in the table 1 represents NO pull off, and NO represents pull off; the step of soldering tin refers to coating tin paste on the surface of the hole-filling slurry of the MWT battery piece, then placing the MWT battery piece in a constant temperature box, observing the curing form and additive residue of the tin paste, wherein OK in the table 1 indicates that the MWT battery piece is full after soldering tin, and NO indicates that the MWT battery piece is not full after soldering tin. The tensile force of the MWT battery piece is tested by solder strip tensile force, and the 30min steady-state amplification represents the current value of the increase of reverse current Irev2 within 30min under the condition of-12 v voltage.
TABLE 1 MWT cell test results
Figure BDA0002735991180000121
Fig. 1 shows the reverse current Irev2 test results for the MWT cells provided in comparative examples 1 to 4. The abscissa in fig. 1 has the unit: a sequence of battery pieces; the unit of the ordinate is: average reverse current value of each cell; t1, T2 and T3 in FIG. 1 represent comparative example 1, comparative example 3 and comparative example 2, respectively; baseline represents comparative example 4 group. As can be seen from fig. 1 and table 1, the reverse current Irev2 is large for comparative example 1, comparative example 3, and comparative example 2, and the reverse current Irev2 is small for comparative example 4. The reverse current Irev2 for examples 1-3 was smaller than the reverse current Irev2 for comparative example 4.
Fig. 2 shows the leakage distribution of the cell of comparative example 1. The leakage position corresponds to the hole plugging position (6 × 6), and the deeper the red color, the larger the leakage.
Fig. 3 shows the appearance of the MWT cell of example 2 after the 3M tape was pulled, and the appearance of the MWT cell pore-filling slurry after curing is shown in the box of fig. 3, and it can be seen that the MWT cell did not fall off after the 3M tape was pulled.
Fig. 4 shows the appearance after the MWT cells of comparative example 4 and comparative example 1 are soldered, the left side of fig. 4 is the appearance after the MWT cell of comparative example 4 is soldered, and the right side is the appearance after the MWT cell of comparative example 1 is soldered; it can be seen that the MWT cell of comparative example 1 was not saturated after soldering, and the MWT cell of comparative example 4 was saturated after soldering.
Fig. 5 shows an appearance of the dupont paste after MWT cell soldering in example 2, the left side of fig. 5 shows an appearance of the dupont paste after MWT cell soldering in example 2, and the right side shows an appearance of the dupont paste after MWT cell soldering; it can be seen that the MWT cells of both example 2 and dupont slurries are relatively full after soldering.
As can be seen from example 1, the MWT battery prepared from the MWT battery hole-filling slurry provided by the embodiment of the present application has less damage to the PN junction, less reverse current Irev2, and a good solder effect.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The composition for preparing the MWT battery hole-filling slurry glass material is characterized by mainly comprising the following components in parts by weight:
60-80 parts of P2O51-8 parts of CuO, 2-8 parts of MgO, 4-10 parts of CaO and 3-8 parts of SiO2And 1-6 parts of K2O。
2. The composition for preparing the MWT battery hole-filling slurry glass material according to the claim 1, which is characterized by mainly comprising the following components in parts by weight:
65-75 parts of P2O53-7 parts of CuO, 3-7 parts of MgO, 5-9 parts of CaO and 5-7 parts of SiO2And 2-5 parts of K2O。
3. A glass material of MWT battery hole-filling slurry is characterized in that,
the glass material of the MWT battery hole-filling slurry is prepared by melting and cooling the composition for preparing the MWT battery hole-filling slurry glass material according to the claim 1 or 2;
optionally, crushing the cooled material.
4. An MWT battery hole-filling paste, which mainly comprises an organic vehicle, conductive particles and the glass frit of claim 3.
5. The MWT battery hole-filling slurry according to claim 4, wherein the MWT battery hole-filling slurry mainly comprises the following components in parts by weight:
8-12 parts of the organic carrier, 80.3-93 parts of the conductive particles and 1-5 parts of the glass frit;
optionally, the MWT battery hole-filling slurry comprises 8.5-9.5 parts of the organic carrier;
optionally, the MWT battery hole-filling slurry comprises 2-3 parts of the glass material.
6. The MWT cell hole-filling paste of claim 5, wherein the conductive particles comprise silver powder and zinc powder;
the silver powder accounts for 80-90 parts by weight of the MWT battery hole-filling slurry; the zinc powder accounts for 0.3-3 parts by weight of the MWT battery hole-filling slurry;
optionally, the silver powder accounts for 85-90 parts by weight of the MWT battery hole-filling slurry; the zinc powder accounts for 0.3-2 parts of the MWT battery hole-filling slurry.
7. The MWT cell hole-filling paste according to claim 6,
the average grain diameter of the silver powder is 1.5-1.7 μm;
optionally, the silver powder has an average particle size of 1.5 to 1.6 μm.
8. The MWT cell hole-filling paste according to claim 6,
the average grain diameter of the zinc powder is 1.6-1.8 mu m;
alternatively, the zinc powder has an average particle diameter of 1.7 to 1.8 μm.
9. The MWT cell hole-filling paste according to any one of claims 4 to 8,
the average grain diameter of the glass frit is 1.8-2.0 μm.
10. An MWT cell, wherein the MWT cell is prepared by filling a grouting hole in a cell sheet with the MWT cell grouting slurry according to any one of claims 4 to 9.
CN202011136927.XA 2020-10-21 2020-10-21 MWT battery, MWT battery hole-filling slurry, glass material and glass material raw material composition Pending CN112382674A (en)

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CN103415892A (en) * 2011-03-15 2013-11-27 E.I.内穆尔杜邦公司 Conductive metal paste for a metal-wrap-through silicon solar cell
CN103959391A (en) * 2011-03-15 2014-07-30 E.I.内穆尔杜邦公司 Conductive metal paste for a metal-wrap-through silicon solar cell
CN104271527A (en) * 2012-05-10 2015-01-07 E.I.内穆尔杜邦公司 Glass composition and its use in conductive silver paste
CN105009224A (en) * 2013-02-05 2015-10-28 E.I.内穆尔杜邦公司 Conductive silver paste for a metal-wrap-through silicon solar cell
CN105122379A (en) * 2012-12-28 2015-12-02 赫劳斯德国有限两和公司 An electro-conductive paste comprising coarse inorganic oxide particles in the preparation of electrodes in mwt solar cells

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102770963A (en) * 2010-02-08 2012-11-07 E·I·内穆尔杜邦公司 Process for the production of a MWT silicon solar cell
CN103415892A (en) * 2011-03-15 2013-11-27 E.I.内穆尔杜邦公司 Conductive metal paste for a metal-wrap-through silicon solar cell
CN103959391A (en) * 2011-03-15 2014-07-30 E.I.内穆尔杜邦公司 Conductive metal paste for a metal-wrap-through silicon solar cell
CN104271527A (en) * 2012-05-10 2015-01-07 E.I.内穆尔杜邦公司 Glass composition and its use in conductive silver paste
CN105122379A (en) * 2012-12-28 2015-12-02 赫劳斯德国有限两和公司 An electro-conductive paste comprising coarse inorganic oxide particles in the preparation of electrodes in mwt solar cells
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